Námaskarð, Mývatn, N-Iceland.
When I arrived, a bus full of English college kids was there waiting for the students who were roaming around the area. They all had their mouths and noses covered and I heard a lot of "oh my god, I have to get into the bus Catherine, it stinks" and "I am dying, this is horrible".
I just breathed with my mouth and tried to focus on what I was seeing :)
Lens:Sigma 10-20mm at 10mm
ISO 100, f5.0, 1/30